Speaker
Description
Sub-femtosecond electron beams would provide a powerful probe of ultrafast electronic and nuclear dynamics, but their generation with both high beam energy and pC-level charge remains challenging. Conventional longitudinal compression requires a large energy chirp and becomes increasingly impractical for hundred-MeV beams, whereas low-energy approaches are strongly limited by space-charge effects and typically operate at very low charge. Here, we propose a two-dimensional beam-compression scheme based on transverse–longitudinal coupling. In this scheme, the compressed bunch length is governed by the beam geometric emittance, allowing the small transverse emittance of modern electron beams to be exploited for ultrashort bunch generation. Start-to-end simulations show that sub-femtosecond bunches with hundred-MeV beam energy and pC-level charge can be produced. This approach offers a potential route toward compact, high-energy attosecond electron beams and may enable sub-femtosecond radiation sources based on undulator radiation or inverse Compton scattering.
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